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Fuel injection apparatus for internal combustion engine

a fuel injection apparatus and internal combustion engine technology, applied in the direction of liquid fuel feeders, machines/engines, electric control, etc., can solve the problems of insufficient amount of vaporized fuel, poor startability, and extremely difficult vaporization of fuel at temperatures lower than the boiling point of alcohol, so as to reduce cost and weight, and simplify the fuel supply system

Active Publication Date: 2012-12-20
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0025]In the first aspect of the present invention, the alcohol concentration of the alcohol blended fuel can be reduced in an inside of the leading end portion of the fuel injector. The alcohol concentration of the fuel to be injected can therefore be reduced immediately whenever necessary (e.g. during cold starting). Since the first aspect of the present invention allows the foregoing effect to be achieved without having a fuel injector for use exclusively for alcohol, the fuel supply system can be simplified for reduction in cost and weight. When fuel is injected with the alcohol adsorbed onto the adsorbent at the leading end portion of the fuel injector, performance of the split injection allows the fuel pressure at the leading end of the injector to be properly inhibited from lowering during an injection period. This prevents the alcohol from being desorbed from the adsorbent during fuel injection even more reliably, so that the above effect can be exhibited even more remarkably.
[0026]The second aspect of the present invention allows completion of the fuel injection to fall reliably within required timing in the split injection.
[0027]The third aspect of the present invention allows necessity of performing the split injection to be determined appropriately.
[0028]The fourth aspect of the present invention allows completion of the fuel injection to fall within the required timing in the split injection even more reliably.
[0029]The fifth aspect of the present invention allows an injection period of each of split injection to be equally shortened, which even more reliably prevents the alcohol from being desorbed from the adsorbent during fuel injection.
[0030]In the sixth aspect of the present invention, if there is a requirement for lowering the alcohol concentration of the fuel to be injected from the fuel injector, fuel having a lowered alcohol concentration can be injected immediately in response to the requirement.

Problems solved by technology

As is known from FIG. 10, therefore, a blended fuel having a high concentration of alcohol, such as E80, has a drawback that the fuel is extremely difficult to vaporize at temperatures lower than the boiling point of alcohol.
This results in an insufficient amount of vaporized fuel that contributes to combustion, thus posing a problem of tendency toward poor startability.
This results in a problem in that the amount of HC discharged into the atmosphere tends to be extremely large during cold starting.

Method used

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  • Fuel injection apparatus for internal combustion engine
  • Fuel injection apparatus for internal combustion engine
  • Fuel injection apparatus for internal combustion engine

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first embodiment

[0043]FIG. 1 is a diagram for illustrating a system configuration of a first embodiment of the present invention. Referring to FIG. 1, the system according to this embodiment includes an internal combustion engine 10. The internal combustion engine 10 is used, for example, as a driving power source for a vehicle. The internal combustion engine 10 of this embodiment is an in-line four-cylinder type; however, the number and arrangement of cylinders of the internal combustion engine according to the present invention are not specifically limited. FIG. 1 is a cross-sectional view of a single cylinder of the internal combustion engine 10.

[0044]The internal combustion engine 10 is operable on not only gasoline, but also a fuel that is a mixture composed of gasoline and ethanol, methanol, or other type of alcohol (hereinafter referred to also as an “alcohol-blended fuel” or a “blended fuel”). In this case, the alcohol-blended fuel may range from one having a low concentration (e.g. about s...

second embodiment

[0077]A second embodiment of the present invention will be described below with reference to FIGS. 8 and 9. Differences from the first embodiment described above will be mainly described and descriptions of similarities will be simplified or omitted.

[0078]FIG. 8 is a graph showing the injection signal and changes in the leading end fuel pressure during performance of the split injection. In FIG. 8, the injection signal shown by a broken line is the same as that of the first embodiment described earlier and the injection signal shown by a solid line represents that of the second embodiment. If the split injection is performed, a pause period is inserted between two split injection periods, so that time it takes to complete entire fuel injection sequences is long as compared with a case of one injection sequence. With a port injection system as in the internal combustion engine 10 shown in FIG. 1, no fuel can enter the combustion chamber after the intake valve 28 closes, so that the f...

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Abstract

A fuel injection apparatus includes: an adsorbent disposed in an internal space of a leading end portion of a fuel injector, the adsorbent being capable of selectively adsorbing an alcohol component in the blended fuel of gasoline and alcohol; fuel pressure controller capable of achieving states in which a pressure of fuel to be supplied to the fuel injector is set to a low or high pressure range having a small or large adsorbed amount of alcohol on the adsorbent; and split injection controller that makes the fuel injector inject fuel for one cycle in a plurality of times, when the pressure of fuel to be supplied to the fuel injector is set to the high pressure range.

Description

TECHNICAL FIELD[0001]The present invention relates to a fuel injection apparatus for an internal combustion engine.BACKGROUND ART[0002]A known internal combustion engine can use a blended fuel that is a mixture of gasoline and alcohol such as ethanol or methanol. FIG. 10 is a chart showing a relationship between a distillation rate and a temperature of E80 (a blended fuel with 80% ethanol), E20 (a blended fuel with 20% ethanol), and E0 (100% gasoline). Gasoline is composed of multiple components including one having a low boiling point which contributes to an outstanding vaporization characteristic even at low temperatures. Alcohol, on the other hand, is composed of a single component and thus has a fixed boiling point which is high (about 78° C. for ethanol). As is known from FIG. 10, therefore, a blended fuel having a high concentration of alcohol, such as E80, has a drawback that the fuel is extremely difficult to vaporize at temperatures lower than the boiling point of alcohol. ...

Claims

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Application Information

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IPC IPC(8): F02M69/04
CPCF02D41/0025Y02T10/32F02D2200/0602F02D2200/0611F02D2250/31F02M43/04F02M61/16Y02T10/36Y02T10/44F02D19/0686F02D19/024F02D19/084F02D19/0668F02D19/061F02D41/34Y02T10/30Y02T10/40
Inventor TSUKAGOSHI, TAKAHIROCHIBA, FUMITOYOSHIOKA, MAMORUONOE, RYOTA
Owner TOYOTA JIDOSHA KK